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Title: Error estimates of background atmospheric CO sub 2 patterns from weekly flask samples

Abstract

The precision and accuracy of trends and seasonal cycles of CO{sub 2}, as determined from grab samples, was investigated. First, the statistical aspects of infrequent (weekly) sampling were studied by simulating, via a partially random procedure, parallel time series of CO{sub 2} flask samples. These simulated flask series were compared to the continuous analyzer records from which they had been derived. The second approach to studying the uncertainties of flask records was to compare real flask results with simultaneous hourly mean concentrations of the in situ analyzers at the Geophysical Monitoring for climatic Change observatories at Point Barrow, Mauna Loa, Samoa, and the south pole. The latter comparisons emphasized experimental, rather than statistical, errors. The uncertainties and sampling biases depend on the site and on the period of averaging. For monthly means the uncertainty varies from 0.2 to 0.6 ppm (one standard deviation, parts per million by volume), being largest for Barrow. Sampling biases for monthly means at Barrow and Mauna Loa are significant, up to 0.5 ppm. Experimental errors are the dominant error source for annual averages, and spurious interannual variations can be up to 0.4 ppm.

Authors:
;  [1];  [2];  [3]
  1. Univ. of Colorado, Boulder (USA)
  2. National Oceanic and Atmospheric Administration, Silver Springs, MD (USA)
  3. Geophysical Monitoring for Climatic Change, Boulder, CO (USA)
Publication Date:
OSTI Identifier:
6061277
Resource Type:
Journal Article
Journal Name:
Journal of Geophysical Research; (USA)
Additional Journal Information:
Journal Volume: 95:D9; Journal ID: ISSN 0148-0227
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; CARBON DIOXIDE; ECOLOGICAL CONCENTRATION; ALASKA; ANNUAL VARIATIONS; ANTARCTICA; CLIMATES; ERRORS; GLOBAL ASPECTS; GREENHOUSE EFFECT; HAWAII; ISLANDS; MEASURING METHODS; MONTHLY VARIATIONS; PACIFIC OCEAN; ANTARCTIC REGIONS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; FEDERAL REGION IX; FEDERAL REGION X; NORTH AMERICA; OXIDES; OXYGEN COMPOUNDS; POLAR REGIONS; SEAS; SURFACE WATERS; USA; VARIATIONS; 540120* - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-); 010900 - Coal, Lignite, & Peat- Environmental Aspects

Citation Formats

Tans, P P, Thoning, K W, Elliott, W P, and Conway, T J. Error estimates of background atmospheric CO sub 2 patterns from weekly flask samples. United States: N. p., 1990. Web.
Tans, P P, Thoning, K W, Elliott, W P, & Conway, T J. Error estimates of background atmospheric CO sub 2 patterns from weekly flask samples. United States.
Tans, P P, Thoning, K W, Elliott, W P, and Conway, T J. Mon . "Error estimates of background atmospheric CO sub 2 patterns from weekly flask samples". United States.
@article{osti_6061277,
title = {Error estimates of background atmospheric CO sub 2 patterns from weekly flask samples},
author = {Tans, P P and Thoning, K W and Elliott, W P and Conway, T J},
abstractNote = {The precision and accuracy of trends and seasonal cycles of CO{sub 2}, as determined from grab samples, was investigated. First, the statistical aspects of infrequent (weekly) sampling were studied by simulating, via a partially random procedure, parallel time series of CO{sub 2} flask samples. These simulated flask series were compared to the continuous analyzer records from which they had been derived. The second approach to studying the uncertainties of flask records was to compare real flask results with simultaneous hourly mean concentrations of the in situ analyzers at the Geophysical Monitoring for climatic Change observatories at Point Barrow, Mauna Loa, Samoa, and the south pole. The latter comparisons emphasized experimental, rather than statistical, errors. The uncertainties and sampling biases depend on the site and on the period of averaging. For monthly means the uncertainty varies from 0.2 to 0.6 ppm (one standard deviation, parts per million by volume), being largest for Barrow. Sampling biases for monthly means at Barrow and Mauna Loa are significant, up to 0.5 ppm. Experimental errors are the dominant error source for annual averages, and spurious interannual variations can be up to 0.4 ppm.},
doi = {},
url = {https://www.osti.gov/biblio/6061277}, journal = {Journal of Geophysical Research; (USA)},
issn = {0148-0227},
number = ,
volume = 95:D9,
place = {United States},
year = {1990},
month = {8}
}